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Q.

Find the square of 43.

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a

1809

b

1849

c

1649

d

1609

answer is B.

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Detailed Solution

432 = (40+3)2 = 40(40+3) + 3(40+3)

= 402+ 40 x 3 + 3 x 40 + 32

= 1600 + 120 + 120 + 9

= 1849

Therefore, the square of 43 is 1849. 

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